White cloud mountain minnow

Water parameters

Tolerated range for this species. Aim for the middle of each band rather than the extremes.

Tank and habitat

Substrate: any.

Behavior

Plant interaction: plant safe.

Feeding

Omnivore that eats anything small enough for its mouth. Flake food, micro pellets, frozen daphnia, frozen brine shrimp, frozen cyclops, and live food. Feeds at the surface and mid-water. Small mouths; crush large flakes. Feed twice daily. Not picky. In outdoor tubs and ponds during summer, they eat mosquito larvae and other aquatic insects without supplemental feeding.

Compatibility

• Cold-water fish that's often overlooked because tropical tanks dominate the hobby. White clouds thrive at 18–22°C, which means they do best in unheated tanks or subtropical setups, not in standard tropical communities at 25–26°C.
• Peaceful and schooling. Groups of 8+ produce the best display, with males competing and showing off their red fin coloring. In smaller groups they fade and hide.
• Good companions: peppered corys, weather loaches, paradise fish, hillstream loaches, and variatus platies. Anything that prefers the same cool temperature range.
• Sometimes sold as feeder fish, which is a disservice. A big school of white clouds in a planted tank at room temperature is as attractive as any tropical community.

Origin and habitat

Type locality is White Cloud Mountain (Baiyun Shan) near Guangzhou, Guangdong Province, China. The species was long thought to be restricted to this area, but wild populations have since been found across a much wider range: Guangdong, Guangxi, Hainan Island, and northern Vietnam, giving a total distribution of roughly 450,000 km². Between 1980 and 2001 the species went unrecorded in nature, leading to fears of extinction; a wild population was found in North Vietnam in 2001, near Guangzhou in 2003, on Hainan Island in 2009, and in Guangxi in 2011. Classified as a second-class state-protected animal in China. Named after Tan Kan Fei, a Chinese boy scout leader who first collected the type species around the 1930s; Tanichthys means "Tan's fish". Originally described by Lin in 1932. Now placed in the family Tanichthyidae following Tan and Armbruster (2018), separated from Cyprinidae. Recent studies have revealed seven cryptic species within the T. albonubes complex, with six new species described in 2022. Adults are small at roughly 3–4 cm. Long-finned ("meteor") and golden color variants have been bred for the trade. All hobby stock is captive-bred; inbreeding in farms has led to genetically weak stock prone to disease and deformities. Prefers cooler water than most tropical fish, consistent with its montane stream origin.

Breeding

One of the easiest egg-layers to breed. In an established planted tank at room temperature, they'll breed continuously with no intervention. Eggs are scattered among fine-leaved plants and moss. Adults don't eat the eggs as aggressively as most tetras, which means fry survival in planted tanks is reasonable even without a separate breeding setup. Eggs hatch in 48-72 hours at 20°C. Fry are tiny but can eat baby brine shrimp within a few days. A dedicated breeding tank with a spawning mop or dense Java moss maximizes yield. Temperature at 20–22°C. No special water chemistry required. The species is so easy to breed that outdoor ponds and tubs in temperate climates produce fry all summer with zero management. This ease of breeding is why white clouds cost almost nothing in stores.

Common problems

Being kept too warm is the primary issue. White clouds sold in tropical sections of fish stores get stocked into 26°C community tanks where they survive but don't thrive. They become lethargic, their coloring fades, their lifespan shortens (from 5+ years at cool temperatures to 2-3 years at tropical temperatures), and they're more susceptible to disease. Room temperature (18–22°C) is ideal. Ich can occur when fish are thermally stressed. The velvet disease (Piscinoodinium) occasionally hits white clouds, showing as a fine gold or rust-colored dusting on the body. Treat with darkness (cover the tank for 3-4 days, as the parasite is light-dependent) plus an anti-parasitic medication. Otherwise, white clouds are extremely hardy, disease-resistant, and trouble-free when kept at appropriate temperatures.

Outdoor pond suitability

Climate

temperate

USDA zones

4–10 (winter low around -34°C or warmer)

Outdoor pond at least 60 cm deep for thermal mass. Local frost depth and surface freezing matter.

Bioload

Further reading

• How to cycle a fish tank
• Stocking ideas by tank size